RTEMS | testsuites/validation: Fix interrupt validation assumptions (!1254)

[SHIVAM DEOLANKAR (@D3athSkulll)]

SHIVAM DEOLANKAR created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1254

Project:Branches: D3athSkulll/rtems:fix-interrupt-priority to rtems/rtos/rtems:main
Author:   SHIVAM DEOLANKAR



## Summary

The interrupt validation tests assumed UINT32_MAX is always an invalid interrupt priority and interrupt vectors are enabled automatically after installing handler.

Update tc-intr-set-priority.c and tc-intr-vector-is-enabled.c to avoid relying on BSP-specific interrupt behavior that fails on RISC-V.

Fixes #5578.

## Generative AI

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1254
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